Together, we will complete an interview, take a recording of your brain waves and give you a short session of painless non-invasive brain stimulation. Stimulation is given while you are awake and alert, and will only activate a small area of cells on the surface of your brain. It is safe and won’t have any lasting impact on your brain activity. Following stimulation, we will perform a blood test to check your hormone levels. Participants must not be taking hormonal medications of any kind (including hormonal contraceptives) at least 3 months prior to testing.